I'm a Sr. Web Developer and I admit, I've had this happen also. One of our users says sometimes while in windows, all of a sudden, their mouse cursor will just jump to one side. I can tell you it's not the user, and it's as if someone was remoting their PC and suddenly jerked the mouse over...but that's definitely not the case. So other than the video driver, what else would be jerkin his cursor like this? It is intermittent and doesn't happen often.